Title

Thermal Cycling And Isothermal Deformation Response Of Polycrystalline Niti: Simulations Vs. Experiment

Keywords

Finite element; Shape memory alloys; Thermal cycling

Abstract

A recent microstructure-based FEM model that couples crystal-based plasticity, the B2 ↔ B19′ phase transformation and anisotropic elasticity at the grain scale is calibrated to recent data for polycrystalline NiTi (49.9 at.% Ni). Inputs include anisotropic elastic properties, texture and differential scanning calorimetry data, as well as a subset of recent isothermal deformation and load-biased thermal cycling data. The model is assessed against additional experimental data. Several experimental trends are captured - in particular, the transformation strain during thermal cycling monotonically increases and reaches a peak with increasing bias stress. This is achieved, in part, by modifying the martensite hardening matrix proposed by Patoor et al. [Patoor E, Eberhardt A, Berveiller M. J Phys IV 1996;6:277]. Some experimental trends are underestimated - in particular, the ratcheting of macrostrain during thermal cycling. This may reflect a model limitation that transformation- plasticity coupling is captured on a coarse (grain) scale but not on a fine (martensitic plate) scale. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Publication Date

8-1-2011

Publication Title

Acta Materialia

Volume

59

Issue

13

Number of Pages

5238-5249

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.actamat.2011.04.063

Socpus ID

79959533804 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/79959533804

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